UPDATE: Spirit announced Thursday afternoon that all checks had been completed, according to a report from CNN.

"We are working diligently to get our customers where they need to go as quickly as possible," airline spokeswoman Misty Pinson told CNN. "We expect to be back to regular schedule later this evening. As always, the safety of our customers is our No. 1 priority."

Hundreds of Spirit Airlines passengers, many of those bound for Atlantic City and LaGuardia, were stranded overnight at Fort Lauderdale-Hollywood International Airport Wednesday evening due to engine problems.

"It's like a homeless shelter. There's people laying on the floor, I mean it’s just insane,” passenger Heather Hart told WSVN in Miami. “I can’t stay over there. It’s hot, there’s screaming, children are crying. It’s just a mess.”

In a statement released by Spirit Airlines, the airliner said they “are completing a proactive and voluntary check on our aircraft engines overnight as a precautionary measure." The checks are in response to engine failure on one of their planes last week.

An angered passenger said Spirit Airlines did little to accommodate those stranded.

"They will not give me my baggage off my plane to go to a different airline. They won't fly my baggage to Newark, or anything like that," passenger Lauren Digangi told WSV. "They will not refund my money. All they did was give me a $7 voucher and told me to wait until then and that time is tentative and scheduled to change."